package com.sky.service.impl;

import com.sky.dto.GoodsSalesDTO;
import com.sky.entity.Orders;
import com.sky.mapper.OrderMapper;
import com.sky.mapper.UserMapper;
import com.sky.service.ReportService;
import com.sky.service.WorkspaceService;
import com.sky.vo.*;
import org.apache.commons.lang3.StringUtils;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.InputStream;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

@Service
public class ReportServiceImpl implements ReportService {

    @Autowired
    private OrderMapper orderMapper;
    @Autowired
    private UserMapper userMapper;
    @Autowired
    private WorkspaceService workspaceService;

    @Override
    public TurnoverReportVO getTurnOver(LocalDate begin, LocalDate end) {
        // x 轴
        List<LocalDate> dateList = getDateList(begin, end);

        // y 轴
        List<Double> turnoverList = new ArrayList<>();
        for (LocalDate date : dateList) {
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
            Map map = new HashMap();
            map.put("status", Orders.COMPLETED);
            map.put("begin", beginTime);
            map.put("end", endTime);
            Double turnover = orderMapper.sumByMap(map);
            turnover = turnover == null ? 0.0 : turnover;
            turnoverList.add(turnover);
        }

        // 数据封装
        TurnoverReportVO turnoverReportVO = TurnoverReportVO.builder()
                .dateList(StringUtils.join(dateList, ","))
                .turnoverList(StringUtils.join(turnoverList, ","))
                .build();
        return turnoverReportVO;
    }

    @Override
    public UserReportVO userReport(LocalDate begin, LocalDate end) {
        List<LocalDate> dateList = getDateList(begin, end);

        List<Integer> newUserList = new ArrayList<>();  // 新增用户数
        List<Integer> totalUserList = new ArrayList<>();  // 总用户数
        for (LocalDate date : dateList) {
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
            // 新增用户数量
            Integer newUser = getUserCount(beginTime, endTime);

            // 总用户数量
            Integer totalUser = getUserCount(null, endTime);
            newUserList.add(newUser);
            totalUserList.add(totalUser);
        }

        UserReportVO userReportVO = UserReportVO.builder()
                .dateList(StringUtils.join(dateList, ","))
                .newUserList(StringUtils.join(newUserList, ","))
                .totalUserList(StringUtils.join(totalUserList, ","))
                .build();

        return userReportVO;
    }

    @Override
    public OrderReportVO orderReport(LocalDate begin, LocalDate end) {
        // x 轴
        List<LocalDate> dateList = getDateList(begin, end);

        // 订单总数列表
        List<Integer> orderCountList = new ArrayList<>();
        // 有效订单数列表
        List<Integer> validOrderCountList = new ArrayList<>();

        for (LocalDate date : dateList) {
            // 从 00:00 - 23:59
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);

            // 订单数
            Integer orderCount = getOrderCount(beginTime, endTime, null);

            // 有效订单数
            Integer validCount = getOrderCount(beginTime, endTime, Orders.COMPLETED);

            orderCountList.add(orderCount);
            validOrderCountList.add(validCount);
        }

        // 时间区间内的订单总数 -- orderCountList 中的数据累加
        Integer totalOrderCount = orderCountList.stream().reduce(Integer::sum).get();
        // 时间区间内的有效订单总数-- validOrderCountList 中的数据累加
        Integer validOrderCount = validOrderCountList.stream().reduce(Integer::sum).get();

        // 订单完成率
        Double orderCompletionRate = 0.0;

        if(totalOrderCount != 0) {
            orderCompletionRate = validOrderCount.doubleValue() / totalOrderCount;
        }

        OrderReportVO orderReportVO = OrderReportVO.builder()
                .dateList(StringUtils.join(dateList, ","))
                .orderCompletionRate(orderCompletionRate)
                .orderCountList(StringUtils.join(orderCountList, ","))
                .totalOrderCount(totalOrderCount)
                .validOrderCount(validOrderCount)
                .validOrderCountList(StringUtils.join(validOrderCountList, ","))
                .build();

        return orderReportVO;
    }

    @Override
    public SalesTop10ReportVO top10(LocalDate begin, LocalDate end) {
        LocalDateTime beginTime = LocalDateTime.of(begin, LocalTime.MIN);
        LocalDateTime endTime = LocalDateTime.of(end, LocalTime.MAX);

        List<GoodsSalesDTO> goodsSalesDTOList = orderMapper.getSalesTop10(beginTime, endTime);

        String nameList = StringUtils.join(goodsSalesDTOList.stream().map(GoodsSalesDTO::getName).collect(Collectors.toList()), ",");
        String numberList = StringUtils.join(goodsSalesDTOList.stream().map(GoodsSalesDTO::getNumber).collect(Collectors.toList()), ",");

        SalesTop10ReportVO salesTop10ReportVO = SalesTop10ReportVO.builder()
                .nameList(nameList)
                .numberList(numberList)
                .build();

        return salesTop10ReportVO;
    }

    @Override
    public void exportBusinessData(HttpServletResponse response) {
        LocalDate begin = LocalDate.now().minusDays(30);
        LocalDate end = LocalDate.now().minusDays(1);

        // 1.查询运营概览数据，提供给 Excel 模板
        BusinessDataVO businessData = workspaceService.getBusinessData(LocalDateTime.of(begin, LocalTime.MIN),
                LocalDateTime.of(end, LocalTime.MAX));
        InputStream in = this.getClass().getClassLoader().getResourceAsStream("template/运营数据报表模板.xlsx");
        try {
            // 2.基于提供好的模板文件创建一个新的 Excel 对象
            XSSFWorkbook excel = new XSSFWorkbook(in);
            // 3.获得 Excel 文件中的一个 Sheet 页
            XSSFSheet sheet = excel.getSheet("Sheet1");
            // 4.准备概览数据
            sheet.getRow(1).getCell(1).setCellValue(begin + "至" + end);
            // 4.1 获得第 4 行
            XSSFRow row = sheet.getRow(3);
            // 4.2 设置单元格 营业额、订单完成率、新增用户数
            row.getCell(2).setCellValue(businessData.getTurnover());
            row.getCell(4).setCellValue(businessData.getOrderCompletionRate());
            row.getCell(6).setCellValue(businessData.getNewUsers());
            // 4.3 获得第 5 行
            row = sheet.getRow(4);
            // 4.4 设置单元格 有效订单、平均客单价
            row.getCell(2).setCellValue(businessData.getValidOrderCount());
            row.getCell(4).setCellValue(businessData.getUnitPrice());

            // 5.准备明细数据
            for (int i = 0; i < 30; i++) {
                LocalDate date = begin.plusDays(i);
                // 5.1 统计当天 00:00 至 23:59 的运营数据
                businessData = workspaceService.getBusinessData(LocalDateTime.of(date, LocalTime.MIN), LocalDateTime.of(date, LocalTime.MAX));
                row = sheet.getRow(7 + i);
                row.getCell(1).setCellValue(date.toString());
                row.getCell(2).setCellValue(businessData.getTurnover());
                row.getCell(3).setCellValue(businessData.getValidOrderCount());
                row.getCell(4).setCellValue(businessData.getOrderCompletionRate());
                row.getCell(5).setCellValue(businessData.getUnitPrice());
                row.getCell(6).setCellValue(businessData.getNewUsers());
            }
            // 5.2 通过输出流将文件下载到客户端浏览器
            ServletOutputStream out = response.getOutputStream();
            excel.write(out);
            out.flush();

            // 6.关闭资源
            out.close();
            excel.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    private Integer getOrderCount(LocalDateTime beginTime, LocalDateTime endTime, Integer status) {
        Map map = new HashMap();
        map.put("status", status);
        map.put("begin", beginTime);
        map.put("end", endTime);
        return orderMapper.countByMap(map);
    }

    private static List<LocalDate> getDateList(LocalDate begin, LocalDate end) {
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);

        // 从 begin 到 end
        while(!begin.equals(end)) {
            begin = begin.plusDays(1);  // 日期计算，获得指定日期后 1 天的日期
            dateList.add(begin);
        }
        return dateList;
    }

    private Integer getUserCount(LocalDateTime beginTime, LocalDateTime endTime) {
        Map map = new HashMap();
        map.put("begin", beginTime);
        map.put("end", endTime);
        return userMapper.countByMap(map);
    }

}
